 | This article relies largely or entirely on a single source .(January 2021) |
| Phymatolithon lenormandii | |
|---|---|
Scientific classification  | |
| (unranked): | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Corallinales |
| Family: | Hapalidiaceae |
| Genus: | Phymatolithon |
| Species: | P. lenormandii |
| Binomial name | |
| Phymatolithon lenormandii (Areschoug) W.H.Adey | |
Phymatolithon lenormandii is a common red alga.
Phymatolithon lenormandii is a thin alga growing encrusting as a thin flat chalky thallus clearly without branches. The thallus grows to 0.6 mm [1] thick with a smooth surface. In colour it is mauvish or pinkish [2] like a thin painted surface forming a patchwork when meeting other incrusting algae. [3]
Common, epilithic on rock and shells in the literal and sublittoral to a depth of 30m, growing best in shady sites. [2] [4]
Monecious or dioecious with conceptacles, carpospogonia and tetrasporangial conceptacles forming raised chambers. [2]
Common around Ireland, Great Britain, Isle of Man and the Channel Isles. [5] In Europe it is recorded from Norway to the Mediterranean. World-wide from Canada USA Mexico, Japan and southern America. [2]
Fucus is a genus of brown algae found in the intertidal zones of rocky seashores almost throughout the world.
Pelvetia canaliculata, the channelled wrack, is a very common brown alga (Phaeophyceae) found on the rocks of the upper shores of Europe. It is the only species remaining in the monotypic genus Pelvetia. In 1999, the other members of this genus were reclassified as Silvetia due to differences of oogonium structure and of nucleic acid sequences of the rDNA.
Atractophora hypnoides is a rare red alga (Rhodophyta) found in the British Isles, France and some Atlantic Islands and is the only species of the genus found in the British Isles. It is attached to the rock or other algae by a small basal disc and is much branched with downgrowing filaments which enclose the main branch or axis forming a cortex. Short filaments of limited growth radiate in whorls from the axis and frequently convert into hairs. The spreading filaments grow irregularly in a diffuse manner. Microscope examination is required for identification.
Corallina officinalis is a calcareous red seaweed which grows in the lower and mid-littoral zones on rocky shores.
Conceptacles are specialized cavities of marine and freshwater algae that contain the reproductive organs. They are situated in the receptacle and open by a small ostiole. Conceptacles are present in Corallinaceae, and Hildenbrandiales, as well as the brown Fucales. In the Fucales there is no haploid phase in the reproductive cycle and therefore no alternation of generations. The thallus is a sporophyte. The diploid plants produce male (antheridia) and female (oogonia) gametangia by meiosis. The gametes are released into the surrounding water; after fusion, the zygote settles and begins growth.
Phymatolithon is a genus of non geniculate coralline red algae, known from the UK, and Australia. It is encrusting, flat, and unbranched; it has tetrasporangia and bisporangia borne in multiporate conceptacles. Some of its cells bear small holes in the middle; this distinctive thallus texture is termed a "Leptophytum-type" thallus surface, and has been posited as a taxonomically informative character. It periodically sloughs off its epithallus, reducing its overgrowth by algae by as much as 50% compared to bare rock.
Dumontia contorta is a relatively small epiphytic algae of the sea-shore.
Polysiphonia lanosa is a common species of the red algae (Rhodophyta) often to be found growing on Ascophyllum nodosum.
Melobesia membranacea is a small marine alga encrusting on the surface of other algae. In the division of the Rhodophyta.
Brongniartella byssoides Schmitz is a small red marine alga.
Halidrys siliquosa is a large marine brown algae.
Plocamium cartilagineum is a medium-sized red marine alga.
Phyllophora crispa is a medium-sized marine red alga.
Phyllophora pseudoceranoides, the stalked leaf bearer, is a small marine red alga.
Codium bursa is a green marine algae of medium size.
Lithophyllum orbiculatum is a species of thalloid coralline algae, which are a red algae whose cell walls contain calcareous deposits.
Gymnogongrus griffithsiae is a small uncommon seaweed.
Hildenbrandia rubra is a marine species of thalloid red alga. It forms thin reddish crusts on rocks and pebbles in the intertidal zone and the shallow subtidal zone. It is a common species with a cosmopolitan distribution, and is able to tolerate a wide range of conditions.
Chylocladia verticillata is a medium-sized red marine alga.
Lithophyllum incrustans is a small pinkish species of seaweed.